-.010" is very good, but it limits your gasket choice somewhat since you want no closer than .035" no greater than .050" (IMHO).
Your quench area is limited to the flat surfaces (unless you weld the chamber in), which isn't as much as I would like. With some luck, the dish will be entirely under the chamber.
The engine was run with the Fisher head and this cam, yes?
I have a strong suspicion that the cam won't work with any GMC factory head. My Fisher ad says "billet Howard cam", and this was because the lobes are placed to line up with the new valve positions, either:
In-Ex-Ex-In-In-Ex-Ex-In-In-Ex-Ex-In, or
In-Ex-In-Ex-In-Ex-Ex-In-Ex-In-Ex-In
which is not in the same sequence as GMC (and 235):
Ex-In-In-Ex-Ex-In-In-Ex-Ex-In-In-Ex
Perhaps Howard can confirm the ID stamp as to which head?
